you to slide the post over an existing 4 x 4 treated pine post, eliminating the need to dig up any concrete that might be beneath the ground. The Oxford can accommodate one mailbox or two\\nBase Required: Yes\\\\nDouble: No\\\\nGround Mount Included: No\\\\nGround Mount Method: 4 x 4\\\\nHouse Number Sign Kit Included: No\\\\nHouse Numbers Included: No\\\\nMailbox Mounting Board/Bracket Included: Yes\\\\nMaterial: Polymer\\\\nMounting Hardware Included: Yes\\\\nNewspaper Tube Included: No\\\\nPackage Contents: Mailbox Post and Hardware\\\\nWarranty: 10-year\\\\nCA Residents: Prop 65 Warning(s): No\\\\nUNSPSC: 24112400